| 单词 | acute angle |
| 释义 | > as lemmasacute angle a. Geometry. Of a plane angle: less than 90 degrees; (also, in non-technical use) considerably less than 90 degrees, sharp. Frequently in acute angle. ΘΚΠ the world > space > shape > angularity > [noun] > angle or corner > acute angle acute angle?a1560 acute1636 the world > relative properties > number > geometry > angle > [adjective] > acute-angled sharp?1537 acute?a1560 acutangular1658 ?a1560 L. Digges Geom. Pract.: Pantometria (1571) i. Defs. sig. B j v Of straight lined angles there are three kindes, the Orthogonall, the Obtuse and the Acute Angle. 1570 H. Billingsley tr. Euclid Elements Geom. i. f. 3 An acute angle is that, which is lesse then a right angle. 1636 W. Bedwell tr. P. de la Ramée Via Regia ad Geometriam v. 65 The alterne angles are made acute and obtuse. 1790 Nat. Hist. in J. White Jrnl. Voy. New S. Wales App. 283 Their base is a triangle of the scalenus kind, or having one angle obtuse and two acute. 1831 T. Walker Elements Geom. (ed. 3) i. 36 The two acute angles of a right triangle are complements of each other. 1879 H. Northcott in Cassell's Techn. Educator IV. 2/2 The softer the material the more acute should be the angle of the cutting tool. 1924 A. J. Allmand & H. J. T. Ellingham Princ. Appl. Electrochem. (ed. 2) xxiv. 626 The acute angle at the apex of the V. 2003 Yoga Jrnl. Mar.–Apr. 143/3 If you have rather short hamstrings,..your left leg will form an acute angle (less than 90 degrees). < as lemmas |
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